Improvement in rake-tooth lathes



4 Sheets-She et l.

S.v BISBEEgx, BAKE TOOTH-LATER.

Patented June 13, 1876.

WAHM

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MPERS, PHOTO-LITHUGRAFHE. WASHINGTON, D. C,

L Sheets-Sheet 2. S. BISBEE.

BAKE TOOTH-LATHE. No.178,587. Patented June 13, 1876.

WITNESSES z E'NTQR 2 N4 PETERS. PMOTO-LJYHOGRAPNER. WASHINGTLJNl Dv CA K 4 Sheets-Sheet 3.

S. BISBEE. BAKE TOOTH-LATHE. No.178,587. Patented Ju1f1e11,1876.

ia l "f :r m k E w WITNESSES: INVENTUB N.PETERS. PMOTOLJTHOGRAPMER. WASHINGTONy D c UNITED STATES SYL'VESTER BISBEE,

OF SUMNER, MAINE.

IMPROVEMENT IN RAKE-TOOTH LATHES.

Specilication forming part of Letters Patent No 178,587, dated June 13, 1876,; application filed January 7, 1876.

To all whom it may concern:

Be it known that -I, SYLvEsTER BIsEEE, of Sumner, in the county of Oxford and State .of Maine, have invented an Improvement in Rake-Tooth Lathes, of which the following is a specification:

The invention will first be described in connection with the drawings, and then pointed out in the claims.

Figure l is a plan view. Fig. 2 is a longitudinal section. Fig. 8 is atransverse section. Fig. 4 is a detail in longitudinal section, showing the devices employed. Fig. 5 is a section and side elevation of the transferring-tube. Fig. 6 is a plan of the ejector. Fig. 7 is a crosssectional elevation 5 and Fig. 8, a plan view, partly broken away.

Similar letters of reference indicate corresponding parts. l

' Sliding on the main frame A, in suitable guides, is a reciprocating carriage, B, which receives its motion, through the connectingrod d, direct from the disk c, turned by the gear and worm E F. Mounted on one end of the carriage B is a long cylinder, G, at the other end ashort cylinder, H, each of which contains eight grooves. These cylinders receive, in addition to the reciprocating motion, a rotary turn of one-eighth of arevolution at each reciprocating motion, one being turned while the rod d is passing over one of its dead-center, and the other while said rod is passing its other center, so as to present the empty grooves to the feeding devices, and those containing the rods and blanks to the devices for forming the teeth in proper order, said feeding and forming devices consisting, essentially, of the feed-plate l, setting-knife 2, cutterhead 3, set-back 4, saw 5, ejector 6, projection 7, and feed-hook 8, together with the devices for turning the tenon, as hereinafter described.

The cylinder G occupying the position shown,

allows a blank at the next turn of cylinder to be cut off bycutter-head3, being held by spring f and stationary knife f2. The feed-knife 2 consists. essentially, ot'- a spring-plate, a5, fastened obliquely on the end of a handle or stock, f1, which is pivoted to the side of board 20, and has a spring, c6, which is fixed under pin la, so as to press the end of plate a5 on the rods in such manner that it acts as a springpawl to shove out the rods. On the next forward movement the rod is carried into the cutter-head and turned. On its next forward motion it is released by the shape of the knife fr', and strikes against the set-back, the object of which is to correct any diii'erence in the length of the blanks.-

of the knife as shown, the rod enters the cone 5 of tube d', where it is cnt oft' by the swinging saw 5. This saw swings freely back and forth on the pivots m m, being driven from a belt on its pulley n, and moves up to the rod by a cam on the disk c actingon'a projection, 3', of the frame N, and thrown back by a spring, T.

To enable the saw to sever the rod easily it requires to receive a slight reciprocating m0- tion to enable it to follow the motion ot' the rod while the crank is passing nearly on the dead-center. This is effected by the cross-bar V of the carriage striking on the projecting pivot m, carrying it forward, the return motion being produced by the spring o. On the next turn of the cylinder the rod is carried into ccntact with the ejector 6. This is formed as shown in Fig. 6, and hung on pivots g g, and held up into the grooves by a spring, c2.

Its operation is as follows: On the forward movement of the cylinder the projection H of the ejector slips up directly behind the piece of a rod, in case the piece is not long enough t'o make a blank, when, 011 the backward movement, the piece is thrown out, the length of the pieces thrown ont being governed by the length of the projection H. On the next turn and forward movement of the cylinder On the next forward movement, the rod l now being clamped by the sharp projection c1 vice, as above described.

the. rod comes in contact with the projection 7 on the brace VI, setting the rod back ush with the cylinder.

On the next turn and forward movement of the cylinder the rod, if there is one in the groove, is carried into contact with the feed-hook 8, by which the rod, or the absence of a rod, governs -the feeding device, as follows: The hook S is provided at its forward end with two projections, one of which catches 0n the pin S, attached tothe carriage, carrying the hook forward, and, through the following devices, feeding a rod into the cylinder. The backward motion of the hook is governed by the rod itself. If there is no rod in the groove the hook enters the groove vbehind the standard of the cylinder G, when,

on the backward motion of the cylinder, the hook is carried with it, working the feed de- I If, however, the groove is filled with a rod, the hook is thrown out of Contact with the standard, and, therefore, is not carried back, but remains in the position shown in the dotted lines, and the feed devices remain stationary until an empty groove comes round there, for the feed is entirely automatic. s

The devices for operating the feed-plate I through the medium of the hook consist of two disks, J J, of which one has an arm jointed tothe hook, and thereby receives its motion. The other receives its motion from the first through the connecting-rod Z, and they, -in turn, communicate to the feed-plate I through the rods P P. The spring for holding the hook up to the grooves is shown at C3.

The feed-knife 2 is composed of a pivoted handle, f1, inclined blade a5, spring 06,"and pin 14, for the purpose of preventing the blade from coming in contact with the cylinder on its backward movement.

The rack for holding the rods one above thc other consists of a bed-plate, U, from which rise bent wires J1, and of a plate, 20, to which is attached the feed-knife, the Whole being supported by the brackets c4 c, and strengthened by the brace VI, which is attached to the frame of the machine. This brace is constructed with a projecting finger, c5, for preventing the rods from being thrown up by the feed-knife out of the grooves; also, with a cone-shaped recess at the end of the tube d', for the purpose of guiding the rods into the tube; also, with a projection, 7, all in vone casting.

The operation of the cylinder H with the tube d is as follows: The tube is of such a length that, when lled with blanks, one projects at the end exact-ly opposite a groove in the cylinder H, so that on the cylinder moving up, the blank enters the groove, being guided in bya spring, I0, on the tube.

The friction-strap A', tightened by the spring B on the standard P1, holds the blanks in the grooves of the cylinder, so that on its backward movement it withdraws the blank from the tube and retains it on the cylinder while being carried over by the rotary movement. At cG is shown a setback,.against which the blank strikes on its next forward movement, for the purpose of regulating the length of the tenon. Having been set as above described, the blank, on its next forward movement, is carried into the cutterhead 3a to be finished.

The device for clamping the blank while being carried up to the cutter is shown above the cylinder H, and consists of a clamp, g1, and spring g2., The clamp serves to secure the blank through the downward pressure on the spring, produced by the cam S2, While, to release the blank, the return movement of the cam lifts the clamp by arm g4. This cam turns in bearings on the standards P1 P1, and receives its motion through the crank P2 and stationaryv slotted stud T2.

After the tenon' is turned the tooth is'car-J receives its return motion on the carriage,

moving forward by the projection 16 on the frame, and the arm V3, receives its return movement by its curved end striking on the inclined box K.

In case the machine is to be employed for turning spool -blanks or pins, all that is required is to remove the cylinder H, and the holding and clamping devices connected therewith, when the machine can be employed for the above purposes with great advantage.

Having thus described my invention, I claim as new and desire to secure by Letters Pateutl. In a lathe, the reciprocating carriage provided with cylinders rotating in opposite directions, as and for the purpose described.

2. The longitudinallygrooved cylinder G, combined with feed-plate I, setting-knife 2, cutter-head 3,. set-back 4:, saw 5, ejector 6, projection 7, and feed-hook 8, as and for the purpose set forth. y

3. A feed-rack for lathes, consisting of bedplate V, bent rods J1, cross -plate 20, having feed-knife, brackets c4, and brace having ngers c5, as and for the purpose described.

4. The combination, with feed plate I and hook S, of the disks J, connecting-rod Z, rods P P, and spring C3, as and for the purpose set forth.

5. The feed-knife 2, composed of a pivoted 9. The combination, with' cam S2, of Vthe handle, f1, inclined blade a5, spring o6, pin 14, gripers g1, spring g2, and arm g, as and for combined and arranged as described. the purpose set forth.

6. The clamping-knife and spring f1, 10. The combination, Withfcam S2, of the combined and arranged with the cylinder in crank P1 and stationary slot-stud T2, as above the manner shown. shown.

7. The set-back c6, combined with tube d SYLVESTER BISBEE. and cylinder H, for the purposes described. Witnesses:

v S. The slotted friction-strap A', spring B', SARAH H. BARRETT, and the griper g, in combination, all for the ELIAS MARSH, purposes described. GILBERT BARRETT. 

